Wall switch is on, power is there, my old SAMSUNG BX2231 monitor and got once it wont turn on no matter how.

I tried the following :

= changed power cable , result : nothing
= changed adapter , result : nothing
= tried with/ without connecting to pc, result : nothing

It was working fine yesterday, and it cannot be turn on, the blue led didn't even blink.
For some reason, it came back alive after few hours on it's own. power cord, adapter, all connected.

I got scared that it might die again for sure one day, so i using new monitor now, S24D390HL.